Decide what should show up on time widget, and when

[teh-cmc]

The time widget currently doesn't display InstanceKeys, whether they were logged explicitly or auto-generated by the DataStore.
On the other hand, we always mention them when selecting a component, which is no doubt confusing to users.

• Should explicitly logged InstanceKeys show up?
• What about auto-generated ones?
• What about cascading side-effects such as empty batches logged by pending clears?
• What about indicators?
• Should the time widget be a faithful representation of the data model ("if it gets returned by a query, then it shows up here")?
• Etc

There is also the notion of "what is an event?": we currently display a "number of events" that corresponds to the number of raw components logged at this point in time. Should we show the number of rows instead, i.e. the number of log calls?